Flash USR Sportster 56 voice fax to V.90 possible?

I have a USR Sportster 56k Voice Fax , I would like to know if anyone out
there knows where I can find a V.90 flash program for this modem.

The 3Com/USR site offers V.90 flash programs for France, U.K, Germany, you
name it, they offer it, for everyone but the States!

Did they offer it for us in the past? Will the U.K. or Germany one work
here?

Any helpful info is very appreciated.

It would be nice to get this old modem up to date, it's a perfectly good
modem. Except for the lack of a V.90 upgrade!

Thanks!

Harry